21. After Mrs. Wang had returned to her house from work, she was cooking dinner.                                                        

                                              A                B                  C                      D    

22. Jimmy threw the ball high in the air, and Betty catching it when it came down.

                     A                  B                                         C               D

23. Linda has worn her new yellow dress only once since she buys it.

                        A               B                            C                           D

24. Debbie, whose father is an excellent tennis player, has been playing tennis since ten years.

            A                                                      B           C                                 D

25. I have seen lots of interesting places when I went on holiday last summer

               A          B              C                                   D

26. The police arrested the man while he is having dinner in a restaurant.

       A                                          B             C                    D

27. Some people are believing there is life on other planets.

   A                        B                                C     D

28. We’ll be cycled to Hoa’s village at this time next Sunday.

       A                                 B           C                  D

29. What will you do if your friends won’t come?

            A            B C                                     D

30. We have written to each other when we were in primary school.

                        A                     B           C          D